US5690951A - Bait with hot melt binder - Google Patents
Bait with hot melt binder Download PDFInfo
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- US5690951A US5690951A US08/470,342 US47034295A US5690951A US 5690951 A US5690951 A US 5690951A US 47034295 A US47034295 A US 47034295A US 5690951 A US5690951 A US 5690951A
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- bait
- applying
- binder
- corn
- cucurbitacin
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/002—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing a foodstuff as carrier or diluent, i.e. baits
- A01N25/006—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing a foodstuff as carrier or diluent, i.e. baits insecticidal
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
- A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
- A01N47/10—Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof
- A01N47/22—O-Aryl or S-Aryl esters thereof
Definitions
- the invention relates to a bait having a particularly effective form and structure for control of various insects and particularly for immature and adult diabroticine beetles.
- Diabroticine beetles are a significant problem during the growth of, inter alia, corn (field, pop, seed, and sweet), beans, Cucurbitaceae (including cucumbers, melons, squash, and pumpkins), peanuts, peas, potatoes, and sweet potatoes. Corn is conveniently used to describe the effects of diabroticine beetles. These pests are the direct or indirect (i.e., as a vector for bacteria and inoculation of melons and squash) cause of millions of dollars of crop and garden damage annually. Damage by these beetles has continued despite over 30 years of attempts at control.
- Diabroticine beetles encompass multivoltine and univoltine species.
- Multivoltine species e.g., the southern corn rootworm
- Univoltine species e.g., northern and western corn rootworm
- the larvae hatch and begin to feed on nearby roots thereby destroying the root's anchoring abilities and the microhairs responsible for mineral, nutrients, and water assimilation. If the plant roots have not been so damaged that the plants falls over, the yield from the affected plants is reduced due to impaired nutrition.
- banding refers to the practice of trying to control the larvae by applying a contact insecticide in or along a furrow containing planted seeds. The theory behind banding is that larvae will enter the treated area when searching for roots and die due to contact with the insecticide.
- bait formulation that would provide a high level of efficacy against immature and mature diabroticine beetles when applied through conventional application equipment as a sprayable aqueous solution, as well as when applied as a dry granular bait.
- Many baits are made by spray drying a mixture of materials to form a particulate solid.
- Spray drying is performed typically by passing an aqueous slurry of ground AI and a binder material (usually a number of materials based on alkylnaphthylene or alkylformaldehyde condensate, calcium silicate, kaolinite, diatomaceous clays) through a nozzle into a tower.
- the droplets are dried at a temperature of about 150° C.
- the slurry droplets form the particulate product and are collected.
- contact between the slurry water and the amount of residual adsorbed water in the binder can degrade many useful insecticides during storage.
- baits according to the invention are particulate composite baits comprising a homogeneous mixture of: (a) a binding agent comprising a polymer that is solid at 25° C. and exhibits a melting point within the range from about 35° C. to about 65° C.; (b) an erosion rate modifier for said binder; (c) 0.01-99 wt % of an insecticide; and (d) 0.01-99 wt % of a feeding stimulant for the target insect population.
- the present bait provides bait in a physical form exhibiting high efficacy made by a water-free, continuous process.
- the homogeneous distribution of feeding stimulant assures that consumption of feeding stimulant will also include consumption of insecticide by target insects until a lethal dose is achieved.
- the use of a molten polymeric binder avoids the need for elevated temperatures to remove water from prior binder formulations that can adversely affect the storage stability of many insecticides.
- the present invention provides a particulate bait containing a binder matrix of a meltable polymer having homogeneously dispersed therein a diabroticine feeding stimulant and an insecticide.
- a meltable polymer permits the baits to be formed into solids by spraying the molten mixture into the top of a cooled congealing tower in a continuous, water-free process.
- substantially water-free denotes a process free of purposefully added water: any water found in the process is de minimis such as from environmental sources.
- the bait can be applied in the form of a dry granular solid or as an aqueous bait suspension applied through conventional spraying equipment.
- Binders for the present bait include materials, particularly polymers, that are solid at 25° C. and exhibit a melting point within the range from about 35° C. to about 65° C. and that are: (a) palatable to target insects; and (b) able to bind together the insecticide and cucurbitacin components at field temperatures yet (c) pass through extruders, sprayers, and agglomeraters conventionally used to form particles.
- binders Materials that can be used as binders according to the invention include polyethylene glycols with a molecular weight within the range of about 1,000 to about 20,000; block copolymers of ethylene oxide and propylene oxide (EO/PO); solid fats (e.g., partially hydrogenated oils like soybean or cottonseed); and various mono-, di- or triglycerides.
- polyethylene glycols with a molecular weight within the range of about 1,000 to about 20,000
- solid fats e.g., partially hydrogenated oils like soybean or cottonseed
- various mono-, di- or triglycerides e.g., partially hydrogenated oils like soybean or cottonseed
- Polyethylene glycol (PEG) useful in the present invention is commercially available in molecular weights ranging from 1,000 to 20,000 with melting points within the range of about -15° C. to 70° C.
- the PEG with a melting point within the range from about 37° C. to about 64° C. forms a nontacky, dry solid at room temperature that is particularly well suited as a binder for the present invention.
- the EO/PO polymers are commercially available in a wide variety of physical and chemical characteristics from BASF Wyandotte Corporation, Performance Chemicals Division, Parsippany, N.J. USA under the PLURONICTM name. These materials are sold as surfactants for emulsions, suspension stabilizers, and associative thickeners.
- the binder of the bait is used in an amount within the range from about 1 wt % to about 95 wt % in a quantity sufficient to provide a structurally sound bait having insecticide and feeding stimulant components homogeneously dispersed therethrough.
- the binder is used in an amount of about 1 wt % to about 50 wt % and more preferably within the range from about 1-35 wt % based on the total weight of the bait.
- the bait should be made to be able to withstand some exposure to water for spray application or to maintain a particulate structure in the treated area.
- the amount of water resistance will, however, depend on the application method, climate, field irrigation needs and cycle, etc.
- the water solubility of the binder for the present invention is adjusted by adding thereto an erosion rate modifier.
- an erosion rate modifier When added in a suitable quantity for the specific component, the water solubility of the binder is reduced to a level sufficient to provide a matrix system that is poorly or insoluble in water at 25° C.
- Particulate baits preferably exhibit a solubility in such cold water of less than about 5% by weight, preferably less than about 2 wt %, and most preferably less than about 1 wt % to be sprayed from conventional tank spraying equipment.
- Suitable erosion rate modifiers include zein, fatty acid-alkanolamides such as MonamidTM Grade S, ethylcellulose, shellac, and any other alcohol soluble/water insoluble materials.
- Suitable erosion rate modifiers include C 12 -C 20 fatty acids (e.g., lauric acid, myristic acid, palmitic acid, stearic acid, and arachidic acid); C 12 -C 20 alcohols (e.g., lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, and arachidyl alcohol); amphophilic esters of fatty acids with glycerol (e.g., monoesters of C 12 -C 20 fatty acids with glyceryl monopalmitate); C 12 -C 20 amines (e.g., lauryl amine, myristyl amine, palmityl amine, stearyl amine, and arachidiyl amine); and amides of C 12 -C 20 fatty acids (e.g., lauric acid, myristic acid, palmitic acid, stearic acid, and arachidic acid); C 12 -C 20 alcohols (e.g.,
- the erosion rate modifier is added in an amount sufficient to reduce the water solubility of the matrix system in 25° C. water. Such amounts are usually within the range of 0.1 wt % to about 10 wt %, generally within the range of about 2-8 wt %.
- Feeding stimulants useful in the present invention include materials that will act as gustatory stimulants, compulsory or otherwise, for the target population. Gustatory stimulants can be insect diet that provides nutrition upon consumption. Feeding stimulants useful for controlling diabroticine populations according to the present invention include any of the cucurbitacins (in solid or liquid form) or milled corn germ associated with less than about 25%, preferably less than about 10%, endosperm.
- cucurbitacin feeding stimulants are described in Canadian Patent No. 1,195,922; U.S. Pat. No. 4,880,624; and The Merck Index, 10th ed., p. 2609 (1983). Briefly summarized, plants in the cucurbitacae order contain small quantities of oxygenated tetracyclic triterpenoid compounds (usually referred to as the cucurbitacins) that are responsible for the bitter taste of the plant tissue. Although compulsively consumed by diabroticine populations, the cucurbitacins provide no known nutritional value to the insect.
- cucurbitacins Seventeen of the cucurbitacins have been isolated and identified by letters, namely cucurbitacins A, B, C, D, E, F, G, H, I, J, K, L, O, P, Q, R, in aglycone (somewhat water soluble) or glycoside (very water soluble) forms.
- the cucurbitacins B, D, E, I aglycone or glycoside forms thereof are preferred feeding stimulants for baits of the present invention.
- the cucurbitacin can be added to the bait as a dilute cucurbitacin-containing solid or liquid with a concentration of less than about 0.01 wt % cucurbitacin, as a purified compound, or as a concentrated liquid containing more than about 0.01 wt %, preferably more than about 0.05 wt %, and even more preferably within the range of 0.05-0.5 wt % cucurbitacins.
- the cucurbitacins can be added as discrete particles homogeneously distributed throughout the bait or as a liquid stream that is homogeneously distributed throughout the bait.
- the cucurbitacin-containing material are preferably added as a discrete plant tissue particles which contain cucurbitacins, cucurbitacin-containing liquids applied to solid carriers such as a corn cob grit, or introduced as a concentrated liquid that is mixed homogeneously into the matrix with the process liquid used to spray dry the baits.
- Particularly preferred forms for introducing a cucurbitacin feeding stimulant component are dried powders of dried plant tissues or as a concentrated cucurbitacin solution containing 20-50 wt % solids and about 0.1-0.5 wt % cucurbitacins.
- Plant tissues containing the highest levels of cucurbitacins include the roots of the buffalo gourd (Cucurbita foetidissima) which, when dried, contain about 0.3% by weight cucurbitacins and fruits of cucurbitacin containing fruits.
- Cucurbita foetidissima the roots of the buffalo gourd
- cucurbitacin-containing materials useful for the invention may come from, inter alia, C. andreana NAUD, C. cylindrata Wats, C. ecuadorensis Cutl. and Whit., C. foetidissima HBK, C. gracilior Bailey, C.
- Buffalo gourd root powder is a preferred source of solid cucurbitacin-containing material for use as the feeding stimulant component in baits of the invention because the root powder contains a significant quantity of starch.
- This starch acts as a sticking agent when wetted to assist the applied bait particles in adhering to the plant surface. Such adhesion properties are advantageous when bait particles are aerially applied.
- starch e.g., food starch
- cucurbitacin-containing plant tissues have a number of practical benefits.
- the inherent chemical composition of cucurbitacin-containing plant tissue is responsible for the compulsive feeding effects.
- Cucurbitacin-containing plant tissues can, therefore, be used in a dry form which reduces the special handling and storage concerns with grinding, formulating, and storing moist plant tissues.
- the stimulation effects are found at such extremely low levels that there are no special handling procedures for handling the cucurbitacin which is quite toxic in its pure form. Only the insecticides might require special handling.
- cucurbitacin-containing shall mean plant tissue solids and either solid or liquid carriers containing at least one of the cucurbitacins A, B, C, D, E, F, G, H, I, I, K, L, O, P, Q, R aglycone or glycoside forms of any of these.
- Insecticides useful for the invention are those effective to control the insect populations by killing or sterilizing the immature or adult beetles. Generally, an amount within the range of 0.01-99 wt %, preferably 0.1-50 wt %, even more preferably an amount within the range of 0.01-25 wt %. A particularly preferred amount of insecticide is within the range from about 5-25 wt % based on the total weight of the bait.
- Insecticides useful in the invention are materials and biological agents that control diabroticine populations through lethal ingestion, sterilization, or other interference with the diabroticine life cycle.
- Exemplary insecticides include solid and liquid forms of the carbamates (e.g., carbaryl, aldicarb, methomyl, carbofuran, bendiocarb, oxamyl, thiodicarb, trimethylcarb); organophosphates (e.g., phorate, terbufos, fonophos, isofenphos, ethoprop, fenamiphos, disulfoton, malathion, parathion, demeton, dimethoate, chlorpyrifos, diazinon, and phosmet); compounds which break down the beetle's digestive tract tissue including fluorine compounds (cryolite), zinc, and mercury; nicotine; rotenone; neem oil or azadiractin; natural or synthetic
- Liquids may be used in the baits homogeneously mixed with the binder.
- the use of microencapsulated liquids or fine solids that become intimately bound are preferred for handling and control.
- organophosphates and the carbamates are preferred with phorate, carbaryl and methomyl being most preferred.
- Baits of the invention exhibit a surprisingly high level of diabroticine control while enabling the application of overall lower levels of insecticide relative to conventional practice.
- the current EPA label application rate for control of diabroticine beetles by carbaryl is 454-908 grams active ingredient (AI) carbaryl per acre of treated area.
- AI active ingredient
- this rate is within the range from about 2 to about 200 g AI/acre, preferably about 5-100 g AI/acre, and most preferably about 20-50 g AI/acre.
- Practical carbaryl formulations will translate into an application rate of 2-20 lbs. of bait per acre when formed as a dry granule using an inert carrier (such as corn cob grit or clay) or 5-50 ounces of bait applied from aqueous solution per acre.
- diabroticidal insecticides other than carbaryl are used in quantities proportional to their diabroticidal efficacy relative to the levels of carbaryl used herein.
- diabroticidal insecticides that are 50% as effective as carbaryl are used in quantities of 5-400 g AI/acre, but insecticides that are twice as effective are used in quantities within the range from about 1-100 g AI/acre.
- the precise application rate of any particular insecticide when supplied in baits of the present invention is readily determinable by one in this art with the exercise of no more than the existing skill level after consideration of the present disclosure.
- Feeding stimulant and insecticide solids exhibiting a size of less than about 100 ⁇ m in diameter are well suited for the present invention.
- the invention is particularly useful for solids having a size within the range from about 0.1 ⁇ m to about 50 ⁇ m and even more useful for solids within the range of 2 ⁇ m to about 30 ⁇ m.
- finely divided or liquid feeding stimulant and insecticide are mixed into molten binder and formed into droplets.
- finely divided solids must be first ground to size with conventional techniques if the solid is not commercially available in a pre-ground form.
- the bait components are added to a molten binder containing any additives and mixed.
- Molten binder is preferably melted in a stirred, jacketed vessel to control the melting temperature.
- the molten binder preferably exhibits a viscosity of less than about 1000 cp, more preferably less than about 500 cp, and most preferably less than about 100 cp to allow particle formation through conventional nozzles and extrusion equipment.
- a solvent for the binder should be used to reduce viscosity. Any solvent is, however, preferably added to the molten binder before adding the solids. Such a solvent will depress the solidification point of the binder in proportion to the amount of solvent used, so some process adjustment may have to be made as noted below to solidify the solids.
- Solvents that can be used for reducing the viscosity of PEG include: alcohols (e.g., isopropyl alcohol, and methyl alcohol) acetone, CELLOSOLVETM (made from butylcellulose); ethyl acetate, and toluene.
- alcohols e.g., isopropyl alcohol, and methyl alcohol
- CELLOSOLVETM made from butylcellulose
- ethyl acetate ethyl acetate
- toluene toluene.
- the encapsulation of liquid feeding stimulant and/or insecticide does not generally need a solvent.
- the added liquid will act as a solvent for the binder and reduce the viscosity accordingly.
- no additional liquids can be carried by the binder. Attempting to add more liquid component adversely affects the structural integrity of the resulting particle.
- the mount of binder is insufficient to impart integrity to the microcapsule.
- An overloaded particle is friable and cannot maintain a structurally intact particle form with even moderate pressure thereby breaking apart and forming undesired fines. Rolling the formed particles between the thumb and forefinger with a moderate crushing pressure will readily reveal whether the loading limit of the binder has been exceeded.
- the structural integrity of the particle can be enhanced by adding to the molten binder a second film-forming polymer to enhance strength.
- Preferred second polymers are alcohol and water soluble with a tensile strength of greater than about 2000 psi and an elongation of greater than about 10%. Solubility of the added film-forming polymer in alcohol will ensure chemical compatibility with the binder, and water solubility will assure that the dispersability and dissolution characteristics of the particle are not significantly affected.
- the strength enhancing second film-forming polymer is used in an amount within the range from about 0.001 wt % to about 5 wt %, even more preferably within the range of 0.1-1 wt %, based on the amount of the binder.
- Preferred second film-forming polymers for enhancing the strength of the resulting particle include cellulose derivatives (i.e., hydroxypropyl cellulose, hydroxyethyl cellulose); polyethylene oxide; polyvinylpyrrolidone, and hydroxypropyl guar.
- Solid or encapsulated forms of one or more spray adjuvants can be carried in the binder.
- Suitable adjuvants include spreader-stickers, nonionic surfactants (e.g., calcium dodecylbenzenesulfonate salts, nonyl and octyl phenolethoxylates, and alkyl naphthylene sulfonates), liquid emulsifiers (e.g., sorbitol esters), dispersing agents (lignin sulfonates and salts thereof), and ultraviolet screening agents (e.g., titanium dioxide, zinc oxide, carbon black, congo red, para-aminobenzoic acid, and the benzophenones).
- nonionic surfactants e.g., calcium dodecylbenzenesulfonate salts, nonyl and octyl phenolethoxylates, and alkyl naphthylene sulfonates
- the temperature of the mixed, molten material is lowered in the stirred vessel to a temperature above the solidification temperature of the molten, homogeneously mixed material.
- the temperature is lowered to a temperature of no more than about 5°-15° C. above the solidification temperature.
- the specific temperature will depend on the particular binder material used as well as any solvents that have been added.
- the mixture will exhibit a melting point within the range from about 40° C. to about 70° C.
- cooling the molten material inside the stirred, jacketed vessel is less expensive and more flexible than constructing a congealing tower or zone that is tall enough to accommodate the required degree of cooling for all possible formulations made by the present invention.
- the molten binder/bait component mixture is sprayed downwardly through any droplet forming device (e.g., nozzles or circular disks exhibiting holes sized to the particle size desired) into the top of a congealing tower or zone.
- any droplet forming device e.g., nozzles or circular disks exhibiting holes sized to the particle size desired
- the droplets solidify as they cool to a temperature (e.g., less than about 70° C., and more preferably less than about 40° C.) below the melting point of the mixture (i.e., the binder and any additives) and form particulate baits.
- the temperature surrounding the device or heated device within the congealing tower should be maintained at a temperature above the flash point of the solvent but below the melting point of the binder. Solvent flashed from the particles can be recovered and reused with conventional vapor recovery systems.
- the molten binder/bait component mixture can be sprayed into a congealing tower through heated nozzles or a heated rotating disk.
- the nozzles or disk are heated to a temperature of at least about 10° C. above the solidification temperature of the binder/bait component mixture.
- a stainless steel disk atomizer is heated with a radiant heater located below the disk and directed upwardly against the bottom of the disk. Virtually any other form of heat can, however, be used.
- the nozzles or disk are preferably heated to a temperature within the range from about 30° C. to about 50° C.
- An air diverter is preferably used for shielding the heated nozzles from contact with the rising cool air. In effect, the diverter is used to divide the cooling tower into a heated zone immediately around the droplet forming orifices and a cooling zone around the periphery for cooling the droplets into solid particles.
- the air flow rate is selected to produce a falling rate to allow sufficient time for the particle to solidify completely by the time the particle reaches the collection area at the bottom of the tower.
- a congealing tower height of about 1-2 m is generally sufficient.
- Solid product particles can be collected easily because the solids are dry and non-tacky at the exit from the congealing zone. In the laboratory, solid product can be collected on a tarp or mat. Commercial processes may wish to use more efficient collection means with chutes, weighing sections, and automatic packaging devices.
- the baits are desirably formed into a roughly spherical bait having a diameter of less than about 1000 ⁇ m.
- 100% of the bait exhibits a particle size within the range from about 100 ⁇ m to about 600 ⁇ m.
- Particularly effective particle sizes are when 100% of the bait particles are within the range of about 150 ⁇ m to about 500 ⁇ m.
- consumption of the feeding stimulant will necessarily involve consumption of the insecticide.
- Dry granular baits will generally exhibit a larger corresponding size within the range from about 800 ⁇ m to about 2000 ⁇ m. Within the range of about 600-800 ⁇ m, the baits can be used as either a sprayable bait or a dry granular bait depending on the cold water solubility of the binder employed.
- One method for applying dry bait particles that has proven to be acceptable is to form a dispensable solid made by loading dry corn cob grit having a size of 40-60 mesh (250-360 ⁇ m) with spray dried microsphere bait particles according to the invention.
- These corn cob particles have an open network of pores that will readily hold fine bait particles such as those of the invention yet present a sufficiently large particle size that the grit particles can be applied aerially without experiencing significant amounts of lost material due to bouncing off the plant surfaces upon landing.
- porous carriers for the present bait particles have a bulk density of about that of corn cob grit.
- the diabroticine beetles will consume bait particles from within the openings of the grit or those that have fallen out as a result of landing on the plant surface. Either mode of consumption results in a high rate of kill.
- a plurality of ⁇ 600 ⁇ m preformed baits such as those dispersed by spraying, can be deposited on a grit carrier and held thereon with the same binder as in the bait or a different binder.
- a preservative can be added in an amount sufficient to inhibit or prevent deterioration during storage and transport.
- Suitable preservatives include a material commercially available under the trademark ProxellTM and sodium benzoate. Suitable amounts of preservatives are within the range from about 0.05 wt % to about 1 wt %, preferably in an amount within the range of about 0.05-0.4 wt %.
- Clays can be used to increase the density of the bait particle when bait according to the invention is formed as a dry granular bait that is distributed without spraying. Clay is added to form a bulk bait density within the range of about 25 to about 50 lb/ft 3 (400-800 kg/m 3 ), preferably within the range of about 30-40 lb/ft 3 (480-640 kg/m 3 ), and even more preferably about 35 lb/ft 3 (560 kg/m 3 ).
- Clays useful in the invention include kaolin, montmorrilonite, attapulgite, and bentonite. Generally, such clays are used as a bait component in an amount within the range from about 1 wt % to about 30 wt %, preferably, about 5 wt % to about 20 wt %.
- Silica can be used in the bait as a binder component to modify extrusion flow characteristics, methods of bait formation, and to alter the density of the final bait. Many forms of silica can be used, but fumed silica having a particle size of less than about 5 microns is preferred. Silica can be used in an amount within the range from about 5-30 wt %, preferably within the range from about 20-30 wt %.
- the baits may also contain one or more attractants for the target insect. Attractants such as those in U.S. Pat. No. 4,880,624 (incorporated herein by reference) are preferred for diabroticine insects.
- Acceptance and palatability of the bait can be enhanced by adding plasticizers (e.g., sorbitol, maltodextrin), food starch, gums (e.g., sodium carboxymethylcellulose, carrageenan, and gellan), and protein sources such as pork gelatin.
- plasticizers e.g., sorbitol, maltodextrin
- food starch e.g., sorbitol, maltodextrin
- gums e.g., sodium carboxymethylcellulose, carrageenan, and gellan
- protein sources such as pork gelatin.
- the present invention provides a method of using the baits to control insect infestations in a variety of plants.
- insect is used herein to denote the control of either immature or adult stages or both immature and adult stages so long as either form consumes solid food for sustenance and growth.
- application of the present baits can be used to control both adults and immature forms thereof simultaneously.
- Insects that can be controlled with the present invention include insects of the diabroticine genus as well as cutworms, wireworms, billbugs, seed corn maggots, grubs, lesser corn stalk borer, seed corn beetle, flea beetles, European and Southwestern corn borer, fire ants and other ant species, onion maggots, sweet potato weevils, root maggots, and other types of chewing insects that feed on a variety of plants and whose feeding is stimulated by cucurbitacins.
- Specific diabroticine insects that are advantageously controlled in accordance with the invention include the banded cucumber beetle (Diabrotica balteata), the green maize beetle (Diabrotica decolor), the twelve-spotted cucumber beetle (Diabrotica duodecimpunctata), the northern corn rootworm (Diabrotica barberi), the southern corn rootworm or spotted cucumber beetle (Diabrotica undecimpunctata howardi), the western spotted cucumber beetle (Diabrotica undecimpunctata undecimpunctata), the western corn rootworm (Diabrotica virgifera virgifera), the striped cucumber beetle (Acalymma vittata), Western striped cucumber beetle (Acalymma trivittata), the Mexican corn rootworm (Diabrotica virgifera zeae), Diabrotica adelpha, D.
- speciosa speciosa D. speciosa vigens, D. viridula, D. cristata, D. undecimpunctata versusato, D. undecimpunctata tenella, and D. undecimpunctata duodecimnotata.
- bait particles of the present invention When used as adulticides on diabroticine insects, bait particles of the present invention are applied to the plant surfaces just before emergence of the adult diabroticine beetles or when monitoring counts indicate an economic level of infestation.
- an economic infestation level for treatment is about 0.5-1 beetles per plant at prevailing crop values and treatment costs. If an economic level of infestation is not seen, commercial fields are not considered to be economically justified for treatment because the losses sustained by beetle damage are worth less than the cost of an average treatment.
- Plants that can be protected according to the present invention include virtually any plant affected by diabroticine beetles. Examples of such plants include, inter alia, corn (field, pop, seed, and sweet), beans, Cucurbitaceae (including cucumbers, melons, squash, and pumpkins), peanuts, peas, potatoes, and sweet potatoes.
- corn field, pop, seed, and sweet
- Cucurbitaceae including cucumbers, melons, squash, and pumpkins
- peanuts peas, potatoes, and sweet potatoes.
- Dry particles or a liquid suspension of the bait particles are distributed over the tops of the plants to be treated by conventional ground or aerial spraying and equivalent methods with or without herbicides and/or plant nutrients that do not adversely affect the activity of the bait.
- the objective of such application methods is to deposit bait particles on the upper surfaces of the plant where the diabroticine beetles will locate them while foraging for food.
- baits When used as a larvacide for diabroticine insects at planting, baits are applied to the soil in a furrow containing plant seeds or along at least one of the sides of the seed-containing furrow. Similarly, the baits can be applied post-emergent to or along a furrow containing plants.
- the bait When applied to the soil, the bait is applied at a rate corresponding to about 400 grams of active insecticidal ingredient per acre or less.
- the baits are applied in the same manner as the conventional practice of banding at a rate within the range from about 100 to about 200 grams of active diabroticidal insecticide per acre. Immature beetles will feed on the cucurbitacin and, due to the structure of the bait, consume or contact a lethal quantity of the associated insecticide.
- Baits according to the present invention were made from the formulations in Table 1.
- the baits of examples 5 and 6 were tested for acceptance and effectiveness in the control of adult diabroticine beetles. Each test was conducted with 15 beetles under the same conditions.
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Abstract
Description
TABLE 1 ______________________________________ Example Weight % Component ______________________________________ 1 41.3 Polyethylene Glycol (Carbowax ™ 4600) 13.7 Carbaryl (99% purity, <50 μm) 40.0 Buffalo Gourd Root powder 5.0 Monamid ™ S 2 41.3 Polyethylene Glycol (Carbowax ™ 4600) 13.7 Carbaryl (99% purity) 40.0 Buffalo Gourd Root powder 5.0 zein in a 90% alcohol/water solution 3 76.0 Polyethylene Glycol (Carbowax ™ 4600) 13.7 Carbaryl (99% purity) 10.0 Monamid ™ S 0.3 Cucurbitacin E glycoside solution 4 81.0 Polyethylene Glycol (Carbowax ™ 4600) 13.7 Carbaryl (99% purity) 5.0 zein in a 90% alcohol/water solution 0.3 Cucurbitacin E glycoside solution 5 70.3 Polyethylene Glycol (Carbowax ™ 3350) 13.7 Carbaryl (99% purity) 6.0 fatty acid amide (Monamid ™ S) 10.0 Cucurbitacin E glycoside solution 6 55.3 Polyethylene Glycol (Carbowax ™ 3350) 13.7 Carbaryl (99% purity) 6.0 fatty acid amide (Monamid ™ S) 15.0 Kaolin clay (WilKlay ™ FE) 10.0 Cucurbitacin E glycoside solution ______________________________________
TABLE 2 ______________________________________ Mortality Rate After Exposure (%) Bait 1 hr. 2 hrs. 3 hrs. 4 hrs. 5 hrs. 24 hrs. ______________________________________ Ex. 5 38 73 73 73 73 89 Ex. 6 40 75 89 89 89 91 ______________________________________
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/470,342 US5690951A (en) | 1991-10-31 | 1995-06-06 | Bait with hot melt binder |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/784,506 US5484587A (en) | 1991-10-31 | 1991-10-31 | Diabroticine bait |
US08/189,355 US5571522A (en) | 1994-01-31 | 1994-01-31 | Bait with corn germ |
US08/194,358 US6174538B1 (en) | 1991-10-31 | 1994-02-08 | Bait with cucurbitacin |
US08/470,342 US5690951A (en) | 1991-10-31 | 1995-06-06 | Bait with hot melt binder |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US07/784,506 Continuation-In-Part US5484587A (en) | 1991-10-31 | 1991-10-31 | Diabroticine bait |
US08/189,355 Continuation-In-Part US5571522A (en) | 1991-10-31 | 1994-01-31 | Bait with corn germ |
US08/194,358 Continuation-In-Part US6174538B1 (en) | 1991-10-31 | 1994-02-08 | Bait with cucurbitacin |
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US5690951A true US5690951A (en) | 1997-11-25 |
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US08/470,342 Expired - Lifetime US5690951A (en) | 1991-10-31 | 1995-06-06 | Bait with hot melt binder |
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